docs: def published(self, for_user=UNSET, force_exchange=False):
          """
          Apply additional filtering of published items over that done in
          `PublishingQuerySet.published` to filter based on additional publising
          date fields used by Fluent.
          """
          if for_user is not UNSET:
              return self.visible()
  
          queryset = super(PublishingUrlNodeQuerySet, self).published(
              for_user=for_user, force_exchange=force_exchange)
  
          # Exclude by publication date on the published version of items, *not*
          # the draft vesion, or we could get the wrong result.
          # Exclude fields of published copy of draft items, not draft itself...
          queryset = queryset.exclude(
              Q(publishing_is_draft=True) & Q(
                  Q(publishing_linked__publication_date__gt=now())
                  | Q(publishing_linked__publication_end_date__lte=now())))
          # ...and exclude fields directly on published items
          queryset = queryset.exclude(
              Q(publishing_is_draft=False) & Q(
                  Q(publication_date__gt=now())
                  | Q(publication_end_date__lte=now())))
  
          return queryset